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| Development and Experimental Research on Fully Hydraulic Variable Valve System for Multi-Cylinder Gasoline Engines |
| DOI： |
| Key Words:IC engine multi-cylinder engine fully hydraulic variable valve system valve lift abnormal intake valve opening |
| Author Name | Affiliation | | LI Xiaorui, XIE Zongfa, CHANG Yingjie, ZHANG Jiong, HUANG Shuo, LI Xiaoxia | 1.School of Mechanical Engineering, Shandong University, Jinan 250061, China； 2.Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education, Shandong University, Jinan 250061, China；3.Longkou Zhongyu Thermotech Co., Ltd., Yantai 265700, China |
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| Abstract:A fully variable hydraulic valve system (FVHVS) for four-cylinder gasoline engines was introduced. In the system, an intake valve was opened by hydraulic oil which was driven by its cam, and seated by the opening of its rotatory control valve, and both its maximum lift and opening duration were governed by the opening timing of its rotatory control valve. All intake valve lifts of the system were measured in a motored valve train test bench. The experimental results show that the maximum valve lift of an intake valve can be continuously varied from 0 to 9.2 mm and the opening duration from 0° to 284° in crank angle. Furthermore, any distortion is not observed in all valve lift curves at the rated engine speed of 5 000 r/min, which means that the FVHVS can meet the demand of high-speed gasoline engines. Moreover, an abnormal opening of intake valve due to mutual interference in a multi-cylinder FVHVS was observed and eliminated by improving the design of rotatory control valves. |
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